.nav {
    height: 40px;
    background-color: #678876;
}

.nav ol {
    display: flex;
    justify-content: space-around;
    line-height: 40px;
}

.nav ol li a {
    color: #ffffff;
}

.nav ol li a:hover {
    color: sandybrown;
    border-bottom: 1px sandybrown solid;
}


/* 内容 */

.article .w {
    display: flex;
}

.arc-top {
    margin-top: 40px;
    width: 280px;
}

.arc-top dl {
    border: 1px solid #ccc;
}

.arc-top dl dt {
    height: 50px;
    background-color: #F8F8F8;
    font-size: 20px;
    font-weight: 700;
    line-height: 50px;
    color: #546F60;
    text-indent: 1em;
    border-bottom: 1px solid #ccc;
}

.arc-top dl dd {
    height: 40px;
    text-indent: 10px;
}

.arc-top dl dd a {
    line-height: 40px;
    color: #757575;
}

.arc-top dl dd:nth-child(2) a,
.arc-top dl dd:nth-child(3) a,
.arc-top dl dd:nth-child(4) a {
    color: red;
}

.arc-top dl dd a:hover {
    color: olive;
    text-decoration: underline;
}

.nav-bottom a {
    display: block;
    margin: 20px 0;
}


/* 图片 */

.art {
    width: 870px;
    margin-top: 40px;
    margin-left: 50px;
}

.art-middle {
    width: 200px;
    height: 250px;
    float: left;
}


/* 放大镜 */

.art-middle .art-pic {
    width: 200px;
    height: 250px;
    border: 1px solid #ccc;
    position: relative;
}

.art-middle .art-pic img {
    width: 200px;
    height: 250px;
}

.art-middle .art-pic span {
    width: 100px;
    height: 80px;
    background-color: rgba(200, 200, 200, 0.5);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
    cursor: move;
}

.art-middle .big-box {
    width: 200px;
    height: 250px;
    overflow: hidden;
    position: absolute;
    left: 800px;
    top: 180px;
    display: none;
    border: 1px solid #757575;
}

.art-middle .big-box img {
    width: 600px;
    height: 750px;
    position: absolute;
    left: 0;
    top: 0;
}


/* 信息 */

.art-right {
    float: right;
    width: 550px;
    border-top: 1px dashed #ccc;
}

.art-right p {
    height: 50px;
    line-height: 50px;
    text-indent: 20px;
    color: #666;
}

.art-right input {
    margin-top: 30px;
    margin-left: 20px;
    width: 150px;
    height: 50px;
    font-size: 20px;
    color: #fff;
    border-radius: 10px;
    border: 0;
    outline: none;
    background-color: #D27C53;
}


/* 简介 */

.bottom {
    padding-top: 50px;
    display: block;
    clear: both;
    margin-bottom: 20px;
}

.bottom h4 {
    width: 800px;
    height: 40px;
    line-height: 40px;
    background-color: #f0f0f0;
    text-indent: 15px;
}

.bottom .essay h6 {
    line-height: 50px;
    font-weight: 400;
    font-size: 16px;
    color: #666;
}

.bottom .essay li {
    line-height: 40px;
    font-size: 14px;
    list-style: inside;
    text-indent: 40px;
}

.bottom .essay p {
    line-height: 30px;
    font-size: 14px;
    color: #777;
    text-indent: 2em;
}